A monopole antenna is mounted in the front side of human body, and a receiver is mounted behind the human body. The human body has 47 layers of tissues with 1 mm resolution. The human body is in the Voxel format and has 380 cells in the x-direction, 586 cells in the y-direction, and 1875 cells in the z-direction. The S-parameters and 3-D SAR distribution are calculated by using GEMS on a computer cluster.